I learned the node structures this week. Those structures consists of nodes and they can be interconnected. It can be used to design a binary tree and any tree of any kind. It is very interesting to work with and also complicated.
 2->3->4->7->None
This might be considered as a linked list. It's rear is pointing toward None. So I can create any tree that I want. Anyways this week I am much better with recursions and it is more easier for me to do work on Nodes.